Thiking of upgrading to HD. I am an existing Dish customer with a 625 in sigle mode down stairs on a Sony Wega 51", and a non dvr duel tunner for the upstairs. Don't rember the upstairs model #. Are there any specials running for existing customers to upgrade to HD? Also my dish is on the 110 and 119. Would they have to install a second dish for HD? Thanks .